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JEE Main 201912 JanuaryMorning Shift
Exam
JEE Main
Year
2019
Date
12 January
Shift
Morning Shift
Subject
Mathematics
Chapter
Hyperbola

JEE Main 2019 · 12 January · Morning Shift · Mathematics · Hyperbola

If the vertices of a hyperbola be at (- 2, 0) and (2, 0) and one of...

If the vertices of a hyperbola be at (−2,0)\left(- 2, 0\right) and \left(2, 0\right)andoneofitsfocibeat(−3,0)and one of its foci be at \left(- 3, 0\right), then which one of the following points does not lie on this hyperbola ?If the vertices of a hyperbola be at (- 2, 0) and (2, 0) and one of its foci be at (- 3, 0) , then which one of the

Options

  1. A(6,52)\left(6, 5\sqrt{2}\right)
  2. B(−6,210)\left(- 6, 2\sqrt{10}\right)
  3. C(26,5)\left(2\sqrt{6}, 5\right)
  4. D(4,15)\left(4, \sqrt{15}\right)

Correct answer

A. (6,52)\left(6, 5\sqrt{2}\right)

Step-by-step solution

If the vertices of a hyperbola be at (- 2, 0) and (2, 0) and one of its foci be at (- 3, 0) , then which one of the

Since, the vertex of the hyperbola are A′{A}^{′}\left(- 2, 0\right)andandA\left(2, 0\right).

Hence, the transverse axis of the hyperbola isx−x - axis and centre is O(0,0)O\left(0, 0\right).

Equation of hyperbola can be taken as

x2a2−y2b2=1\dfrac{{x}^{2}}{{a}^{2}} - \dfrac{{y}^{2}}{{b}^{2}} = 1

⇒a=2andae=3⇒ a = 2 and ae = 3

⇒e=32⇒ e = \dfrac{3}{2}

Since, b2=a2(e2−1)⇒b2=a2e2−a2=9−4=5{b}^{2} = {a}^{2}\left({e}^{2} - 1\right) ⇒ {b}^{2} = {a}^{2}{e}^{2} - {a}^{2} = 9 - 4 = 5

Hence, equation of hyperbola is x24−y25=1\dfrac{{x}^{2}}{4} - \dfrac{{y}^{2}}{5} = 1

Clearly, point \left(6, 5\sqrt{2}\right) doesn't lies on the hyperbola.

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